b1os, which roaster is that COE from?
pB, I'd try to look for dry- or natural-process Ethiopians if you want to avoid the stupid acid bombs that 3rd wavers like. Blue Bottle's Nekisse is actually quite good despite its high price and pretentious packaging. Coava's Kilenso is just as good, but cheaper and less pretentious, but you can probably get the BB locally.
I just dropped in to my local roaster and picked up a batch of Ethiopian Kochere he roasted this morning. It will be interesting to see how the coffee changes over the next few days. Apparently coffee needs to rest about 48 hours after roasting.
Grinder maintenance: http://www.vvlgar.com/how-to-clean-a-coffee-grinder
They say that steel burrs should last around 5 years. No idea what kind of duty cycle that's for.